bmx art 0414/0814 analog input modules · bmx art 0414/814 120 35011978 07/2012 analog input values...

35011978 07/2012 113

6

Modicon M340 with Unity Pro

BMX ART 0414/814

35011978 07/2012

BMX ART 0414/0814 Analog Input

Modules

Subject of this Chapter

This chapter presents the BMX ART 0414/0814 modules, their characteristics and

explains how they are connected to the various sensors.

What Is in This Chapter?

This chapter contains the following topics:

Topic Page

Presentation 114

Characteristics 115

Analog Input Values 120

Functional Description 123

Wiring Precautions 128

Wiring Diagram 132

Use of the TELEFAST ABE-7CPA412 Accessory 135

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114 35011978 07/2012

Presentation

Function

The BMX ART 0414/0814 modules are multi-range acquisition devices with four

inputs for the 0414 and eight inputs for the 0814. The inputs are isolated from each

other. These modules offer the following ranges for each input, according to the

selection made at configuration:

RTD IEC Pt100/Pt1000, US/JIS Pt100/Pt1000, Cu10, Ni100/Ni1000 in 2, 3 or 4

wires

thermocouple B, E, J, K, L, N, R, S, T, U

voltage +/- 40 mV to 1.28 V.

Presentation

These modules offer the following ranges for each input, according to the selection

made at configuration:

Cu50 6651-94, Cu100 6651-94 in 2, 3 or 4 wires

Illustration

The BMX ART 0414/0814 analog input modules looks like this:

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Characteristics

General Characteristics

The general characteristics for the BMX ART 0414/BMX ART 0414H (see page 45)and BMX ART 0814/BMX ART 0814H (see page 45) modules are as follows:

Modules ART 0414 ART 0814

Type of inputs Isolated, RTD, thermocouple and voltage inputs

Nature of inputs +/- 40 mV; +/- 80 mV; +/- 160 mV; +/- 320 mV; +/- 640 mV; 1.28 V

Number of channels 4 8

Acquisition cycle time 400 ms / 4 channels 400 ms / 8 channels

Conversion method Σ∆

Resolution 15-bit + sign

Isolation:

Between channels

Between channels and bus

Between channels and ground

750 Vdc

1400 Vdc

750 Vdc

Maximum authorized over voltage for

inputs

+/- 7.5 Vdc

Cold junction compensation Internal compensation using the dedicated TELEFAST ABE-

7CPA412 wiring accessory, including a sensor.

External compensation dedicating channel 0 to a 2/3-wires Pt100

for CJC.

External compensation using the CJC values of channels 4/7 for

channels 0/3. In this case, only one sensor is needed.

Input filter Low pass filter (1st order numerical)

Rejection in differential mode (50/60 Hz) Typically 60 dB

Common mode rejection (50/60 Hz) Typically 120 dB

Power consumption (3.3 V) Typical 0.32 W 0.32 W

Maximum 0.48 W 0.48 W

Power consumption (24 V) Typical 0.47 W 1.00 W

Maximum 1.20 W 1.65 W

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Voltage Input Characteristics

The characteristics of the voltage inputs of the BMX ART 0414/BMX ART 0414H

(see page 45) and BMX ART 0814/BMX ART 0814H (see page 45) modules are as

follows:

RTD Input Characteristics

The characteristics of the RTD inputs of the BMX ART 0414/BMX ART 0414H

(see page 45) and BMX ART 0814/BMX ART 0814H (see page 45) modules are as

follows:

Voltage range +/- 40 mV; +/- 80 mV; +/- 160 mV; +/- 320 mV; +/- 640 mV;

1.28 V

Input impedance Typically 10 MOhms

Maximum converted value +/- 102.4%

Maximum resolution 2.4 µV in the range +/- 40 mV

Measurement error for standard module

At 25° C (77° F) 0.05% of FS (1)

Maximum in the

temperature range

0...60° C (32...140° F)

0.15% of FS (1)

Measurement error for Hardened module

At 25° C (77° F) 0.05% of FS (1)

Maximum in the

temperature range -

25° C..70° C (-13...140° F)

0.20% of FS (1)

Temperature drift 30 ppm/° C

Legend:

(1) FS: Full Scale

RTD Pt100 Pt1000 Cu10 Ni100 Ni1000

Measurement range In accordance with IEC: -175... +825° C

(-347...+1517° F)

In accordance with US/JIS: -87 +437° C

(-125...+819° F)

-91... +251° C (-132

...+484° F)

-54 +174° C (-

65...+345° F)

Resolution 0.1° C (0.2° F)

Detection type Open circuit (detection on each channel)

Legend

(1) Excluding errors caused by the wiring, +/- 1° C (0.2° F) on the range -100...+200° C (-148...+392° F) for Pt100

(2) See detailed errors at the temperature point (see page 332).

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Error at 25° C (77° F) (1) +/- 2.1 ° C (+/- 3.8° F) +/- 2.1 ° C (+/- 3.8° F) +/- 4 ° C (+/- 7.2° F) +/- 2.1 ° C

(+/- 3.8° F)

+/- 0.7 ° C

(+/- 1.3° F)

Maximum error for

standard modules in

the temperature range

0...60° C (32...140° F) (2)

+/- 3 ° C (+/- 5.4° F) +/- 3 ° C (+/- 5.4° F) +/- 4 ° C (+/- 7.2° F) +/- 3 ° C

(+/- 5.4° F)

+/- 1.3 ° C

(+/- 2.3° F)

Maximum error for

Harened modules in

the temperature range

-25° C..70° C (-

13...140° F) (2)

+/- 3.5 ° C (+/- 6.3° F) +/- 3.5 ° C (+/- 6.3° F) +/- 4.5 ° C (+/- 8.1° F) +/- 3.5 ° C

(+/- 6.3° F)

+/- 1.5 ° C

(+/- 2.7° F)

Maximum wiring resistance

4-wire 50 Ohms 500 Ohms 50 Ohms 50 Ohms 500 Ohms

2/3-wire 20 Ohms 200 Ohms 20 Ohms 20 Ohms 200 Ohms


RTD Pt100 Pt1000 Cu10 Ni100 Ni1000

Legend

(1) Excluding errors caused by the wiring, +/- 1° C (0.2° F) on the range -100...+200° C (-148...+392° F) for Pt100


RTD CU50 CU100

Measurement range -200...+200° C



Error at 25° C (77° F) (1) +/- 2.1° C (+/- 3.8° F)

Maximum error for standard modules in the

temperature range 0...60° C (32...140° F) (2)

+/- 3° C (+/- 5.4° F)

Maximum error for Hardened modules in

the temperature range -25° C..70° C (-

13...140° F) (2)

+/- 3.5° C (+/- 6.3° F)

Maximum wiring resistance:

4-wire

2/3-wire

50 Ohms

20 Ohms


Legend

(1) Excluding errors caused by the wiring, +/- 1° C (0.2° F) on the range -100...+200° C

(-148...+392° F) for Pt100


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Thermocouple Input Characteristics

This table presents the general characteristics of the thermocouple inputs of the

BMX ART 0414/BMX ART 0414H (see page 45) and

BMX ART 0814/BMX ART 0814H (see page 45) modules.

Thermocouples B E J K L

Measurement range +171 +1,779° C

(340...3234° F)

-240 +970° C

(-400...1778° F)

-177 +737° C

(-287...1359° F)

-231 +1,331° C

(-384...2428° F)

-174 +874° C

(-281...1605° F)

Thermocouples N R S T U

Measurement range -232 +1,262° C

(-386...2304° F)

-9 +1,727° C

(340...3234° F)

-9 +1,727° C

(-15...3141° F)

-254 +384° C

(-425...723° F)

-181 +581° C

(-294...1078° F)



Error at 25° C +/- 3.2° C for J, L, R, S and U types (see Characteristics of the BMX ART 0414/814

Thermocouple Ranges in Degrees Celsius, page 334 for detailed errors at temperature

point for each type); +/- 3.7° C for B, E, K, N and T types

Maximum error for

standard modules in the

temperature range -

25° C..70° C (-13...140° F) (2)

+/- 4.5° C (+/-8.1° F) for types: J, L, R, S and U; +/- 5° C (+/-9° F) for types: B, E, K, N and

T (using the TELEFAST accessory with its internal cold junction compensation).

Maximum error for

Hardened modules in the

temperature range -

25° C..70° C (-13...140° F) (2)

+/- 5.5° C (+/-9° F) for types: J, L, R, S and U; +/- 6° C (+/-10.8° F) for types: B, E, K, N

and T (using the TELEFAST accessory with its internal cold junction compensation).


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Resistive Input Characteristics

The characteristics of the resistive inputs of the BMX ART 0414/BMX ART 0414H

(see page 45) and BMX ART 0814/BMX ART 0814H (see page 45) are as follows.

Range 400 Ω; 4000 Ω

Type measurement 2, 3, 4 wires

Maximum resolution 2.5 mΩ in the range 400 Ω

25 mΩ in the range 4000 Ω

Measurement error for

standard module

At 25° C (77° F) 0.12% of FS (1)

Maximum in the

temperature range 0...60° C

(32...140° F)

0.2% of FS (1)

Measurement error for

ruggedized module

At 25° C 0.12% of FS (1)

Maximum in the

temperature range -

25° C..70° C (-13...140° F)

0.3% of FS (1)


Legend:

(1) FS: Full Scale

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Analog Input Values

Description

For RTD and TC sensors, the data is a multiple of 10 of the real temperature in ° C

or ° F. The last digit represents 0.1° C or 0.1° F.

For millivoltmeter, the data ranges from 40 mV, 320 mV to 1280 mV and is also a

multiple of 10 of the real measurement. The last digit represents 10 nV.

For millivoltmeter, the data range of 640 mV is a multiple of 100 of the real

measurement. The last digit represents 100 nV.

RTD Ranges

The table below presents the ranges for the RTD sensors (values in brackets are in

1/10° F).

Range Under flow Lower scale Upper scale Over flow

Pt100 IEC 751-1995, JIS C1604-1997 (2/4 wires) -1990

(-3260)

-1750

(-2830)

8250

(15170)

8490

(15600)

Pt1000 IEC 751-1995, JIS C1604-1997 (2/4 wires) -1990

(-3260)

-1750

(-2830)

8250

(15170)

8490

(15600)

Ni100 DIN43760-1987 (2/4 wires) -590

(-750)

-540

(-660)

1740

(3460)

1790

(3550)

Ni1000 DIN43760-1987 (2/4 wires) -590

(-750)

-540

(-660)

1740

(3460)

1790

(3550)

Pt100 IEC 751-1995, JIS C1604-1997 (3 wires) -1990

(-3260)

-1750

(-2830)

8250

(15170)

8490

(15600)

Pt1000 IEC 751-1995, JIS C1604-1997 (3 wires) -1990

(-3260)

-1750

(-2830)

8250

(15170)

8490

(15600)

Ni100 DIN43760-1987 (3 wires) -590

(-750)

-540

(-660)

1740

(3460)

1790

(3550)

Ni1000 DIN43760-1987 (3 wires) -590

(-750)

-540

(-660)

1740

(3460)

1790

(3550)

JPt100 JIS C1604-1981, JIS C1606-1989 (2/4 wires) -990

(-1460)

-870

(-1240)

4370

(8180)

4490

(8400)

JPt1000 JIS C1604-1981, JIS C1606-1989 (2/4

wires)

-990

(-1460)

-870

(-1240)

4370

(8180)

4490

(8400)

JPt100 JIS C1604-1981, JIS C1606-1989 (3 wires) -990

(-1460)

-870

(-1240)

4370

(8180)

4490

(8400)

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TC Ranges

The table below presents the ranges for the TC sensors (values in brackets are in

(1/10° F).

JPt1000 JIS C1604-1981, JIS C1606-1989 (3 wires) -990

(-1460)

-870

(-1240)

4370

(8180)

4490

(8400)

Cu10 (2/4 wires) -990

(-1460)

-910

(-1320)

2510

(4840)

2590

(4980)

Cu10 (3 wires) -990

(-1460)

-910

(-1320)

2510

(4840)

2590

(4980)



Type J -1980

(-3260)

-1770

(-2870)

7370

(13590)

7580

(13980)

Type K -2680

(-4500)

-2310

(-3830)

13310

(24270)

13680

(24940)

Type E -2690

(-4510)

-2400

(-3990)

9700

(17770)

9990

(18290)

Type T -2690

(-4520)

-2540

(-4250)

3840

(7230)

3990

(7500)

Type S -500

(-540)

-90

(160)

17270

(29550)

17680

(30250)

Type R -500

(-540)

-90

(160)

17270

(29550)

17680

(30250)

Type B 1320

(2700)

1710

(3390)

17790

(32000)

18170

(32000)

Type N -2670

(-4500)

-2320

(-3860)

12620

(23040)

12970

(23680)

Type U -1990

(-3250)

-1810

(-2930)

5810

(10770)

5990

(11090)

Type L -1990

(-3250)

-1740

(-2800)

8740

(16040)

8990

(16490)

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Voltage Ranges

The table below presents the voltage ranges.

Resistance Ranges

The table below presents the resistance ranges.


+/- 40 mV -4192 -4000 4000 4192

+/- 80 mV -8384 -8000 8000 8384

+/- 160 mV -16768 -16000 16000 16768

+/- 320 mV -32000 -32000 32000 32000

+/- 640 mV -6707 -6400 6400 6707

+/- 1280 mV -13414 -12800 12800 13414


0-400 Ohms 2/4 wires 0 0 4000 4096

0-4000 Ohms 2/4 wires 0 0 4000 4096

0-400 Ohms 3 wires 0 0 4000 4096

0-4000 Ohms 3 wires 0 0 4000 4096

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Functional Description

Function

The BMX ART 0414/814 modules are multi-range acquisition devices with four

inputs for the BMX ART 0414 and eight inputs for the BMX ART 0814.

Both Modules offer the following ranges for each input, according to the selection

made during configuration:

RTD: IEC Pt100, IEC Pt1000, US/JIS Pt100, US/JIS Pt1000, Copper CU10,

Ni100 or Ni1000

thermocouple: B, E, J, K, L, N, R, S, T or U,

voltage: +/- 80 mV, +/- 80 mV, +/- 160 mV, +/- 320 mV, +/- 640 mV, +/- 1.28 V,

ohms: 0..400 Ω, 0..4000 Ω.

NOTE: The TELEFAST2 accessory referenced ABE-7CPA412 facilitates

connection and provides a cold junction compensation device.

Illustration

The BMX ART 0414/0814 input modules perform the following functions.

BMX ART 0414/814

124 35011978 07/2012

Details of the functions are as follows.

Display of Electrical Range Measurements

Measurements may be displayed using standardized display (in %, to two decimal

places).

It is also possible to define the range of values within which measurements are

expressed, by selecting:

the lower threshold corresponding to the minimum value for the range -100.00 %

the upper threshold corresponding to the maximum value for the range +100.00

%

These lower and upper thresholds are integers between -32,768 and 32,768.

Address Element Function

1 Adapting the Inputs Adaptation consists in a common mode and ifferential mode filter. Protection

resistors on the inputs allowt to withstand voltage spikes of up to +/- 7.5 V.

A layer of multiplexing allows self-calibration of the acquisition device offset, as

close as possible to the input terminal, as well as selecting the cold junction

compensation sensor included in the TELEFAST housing.

2 Amplifying Input

Signals

Built around a weak-offset amplifier internal to the A/N converter.

A current generator ensures the RTD resistance measurement.

3 Conversion The converter receives the signal issued from an input channel or from the cold

junction compensation. Conversion is based on a Σ ∆ 16 -bit converter. There is a

converter for each input.

4 Transforming

incoming values

into workable

measurements for

the user

recalibration and alignment coefficients to be applied to measurements, as well

as the module’s self-calibration coefficients

(numeric) filtering of measurements, based on configuration parameters

scaling of measurements, based on configuration parameters

5 Communicating

with the Application

manages exchanges with CPU.

topological addressing

receiving configuration parameters from module and channels

sending measured values, as well as module status, to the application

6 Module monitoring

and sending error

notification back to

application

conversion string test

range under/overflow on channels and cold junction compensation process test

watchdog test

7 Cold Junction

Compensation

internal compensation using the TELEFAST ABE-7CPA412

external compensation by Pt100

external compensation using the CJC values of channels 4/7 for channels 0/3.

In this case, only one sensor is needed

Type of Range Display

Bipolar range from -10,000 to +10,000 (-100.00 % to +100.00 %)

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35011978 07/2012 125

Display of Temperature Range Measurements

Measurements provided to the application are directly usable. It is possible to

choose either "In Temperature" Display or Standardized Display:

for "In Temperature" display mode, values are provided in tenths of a degree

(Celsius or Fahrenheit, depending on the unit you have selected).

for the user-specified display, you may choose a Standardized Display 0...10,000

(meaning from 0 to 100.00 %), by specifying the minimum and maximum

temperatures as expressed in the 0 to 10,000 range.

Measurement Filtering

The type of filtering performed by the system is called "first order filtering". The

filtering coefficient can be modified from a programming console or via the program.

The mathematical formula used is as follows:

where:

α = efficiency of the filter

Mesf(n) = measurement filtered at moment n

Mesf(n-1) = measurement filtered at moment n-1

Valg(n) = gross value at moment n

You may configure the filtering value from 7 possibilities (from 0 to 6). This value

may be changed even when the application is in RUN mode.

NOTE: Filtering may be accessed in Normal or Fast Cycle.

The filtering values are as follows. They depend on the sensor type. T is a cycle time

of 200 ms for TC and mV. T is also a cycle time of 400 ms for RTD and Ohms.

Desired Efficiency Required

Value

Corresponding α Filter

Response

Time at 63%

Cut-off Frequency

(in Hz)

No filtering 0 0 0 0

Low filtering 1

2

0.750

0.875

4 x T

8 x T

0.040 / T

0.020 / T

Medium filtering 3

4

0.937

0.969

16 x T

32 x T

0.010 / T

0.005 / T

High filtering 5

6

0.984

0.992

64 x T

128 x T

0.025 / T

0.012 / T

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126 35011978 07/2012

The values may be displayed using standardized display (in %, to two decimal

places).

The user may also define the range of values within which measurements are

expressed, by selecting:

the lower threshold corresponding to the minimum value for the range -100.00 %

the upper threshold corresponding to the maximum value for the range +100.00

%.

These lower and upper thresholds are integers between -32,768 and +32,767.

Main frequency 50/60 Hz Rejection

Depending on the country, the user can configure the frequency rejection of main

power harmonics by adapting the speed of sigma delta converter.

Sensor Alignment

The process of "alignment" consists in eliminating a systematic offset observed with

a given sensor, around a specific operating point. This operation compensates for

an error linked to the process. Therefore, replacing a module does not require a new

alignment. However, replacing the sensor or changing the sensor’s operating point

does require a new alignment.

Conversion lines are as follows:

Type of Range Display

Unipolar range from 0 to 10,000 (0 % at +100.00 %)

Bipolar range from -10,000 to 10,000 (-100.00 % to +100.00 %)

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35011978 07/2012 127

The alignment value is editable from a programming console, even if the program is

in RUN Mode. For each input channel, you can:

view and modify the desired measurement value.

save the alignment value.

determine whether the channel already has an alignment.

The alignment offset may also be modified through programming.

Channel alignment is performed on the channel in standard operating mode, without

any effect on the channel’s operating modes.

The maximum offset between measured value and desired (aligned) value may not

exceed +/-1,500.

NOTE: To align several analog channels on the BMX ART/AMO/AMI/AMM

modules, we recommand proceeding channel by channel. Test each channel after

alignment before moving to the next channel in order to apply the parameters

correctly.

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128 35011978 07/2012

Wiring Precautions

Introduction

In order to protect the signal from outside interference induced in series mode and

interference in common mode, we recommend that you take the following

precautions.

Cable Shielding

Connection at the FCN connectors:

Given that there are a large number of channels, a cable of at least 10 twisted

pairs is used, with general shielding (outside diameter 10 mm maximum), fitted

with one or two male 40-pin FCN connectors for direct connection to the module.

Connect the cable shielding to the grounding bar. Clamp the shielding to the

grounding bar on the module side. Use the BMX XSP 0400/0600/0800/1200

electromagnetic protection kit (see Modicon M340 Using Unity Pro, Processors,

Racks, and Power Supply Modules, Setup Manual) to connect the shielding.

TELEFAST connection:

Connect the sensor cable shielding to the terminals provided and the whole

assembly to the cabinet ground.

DANGERHAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

While mounting / removing the modules:

make sure that each terminal block is still connected to the shield bar and

disconnect voltage supplying sensors and pre-actuators.

Failure to follow these instructions will result in death or serious injury.

BMX ART 0414/814

35011978 07/2012 129

BMX ART 0414/814

130 35011978 07/2012

Sensors shielding

In order for the acquisition system to operate correctly, we recommend you take the

following precautions:

if sensors are isolated from ground, all the shields of the sensor cables must be

referenced to the Telefast/PLC ground.

if sensors are referenced to the sensor ground which is far from PLC ground, all

the shields of the sensor cables must be referenced to the sensors ground to

eliminate the ground loop path.

Using the Sensors Isolated from the Ground

The sensors are connected according to the following diagram:

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35011978 07/2012 131

If the sensors are referenced in relation to the ground, this may in some cases return

a remote ground potential to the terminals or the FCN connector. It is therefore

essential to follow the following rules:

the potential must be less than the permitted low voltage: for example, 30 Vrms

or 42.4 VDC.

setting a sensor point to a reference potential generates a leakage current. You

must therefore check that all leakage currents generated do not disturb the

system.

Sensors and other peripherals may be connected to a grounding point some

distance from the module. Such remote ground references may carry considerable

potential differences with respect to local ground. Induced currents do not affect the

measurement or integrity of the system.

Electromagnetic Hazard Instructions

DANGERHAZARD OF ELECTRIC SHOCK

Ensure that sensors and others peripherals are not exposed through grounding

points to voltage potential greater than acceptable limits.

Failure to follow these instructions will result in death or serious injury.

CAUTIONUNEXPECTED BEHAVIOR OF APPLICATION

Follow those instructions to reduce electromagnetic perturbations:

use the BMX XSP 0400/0600/0800/1200 electromagnetic protection kit

(see Modicon M340 Using Unity Pro, Processors, Racks, and Power Supply

Modules, Setup Manual) to connect the shielding.

Electromagnetic perturbations may lead to an unexpected behavior of the

application.

Failure to follow these instructions can result in injury or equipment damage.

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132 35011978 07/2012

Wiring Diagram

Introduction

The BMX ART 0414 input module consists of a 40-pin FCN connector.

The BMX ART 0814 input module consists of two 40-pin FCN connectors.

Connector Pin Assignment and Sensors Wiring

This example uses a probe configuration with:

Channel 0/4: Thermocouple

Channel 1/5: 2-wires RTD



WARNINGUNEXPECTED EQUIPMENT OPERATION

Take every precaution at the installation to prevent any subsequent mistake in the

connectors. Plugging the wrong connector would cause an unexpected behavior

of the application.

Failure to follow these instructions can result in death, serious injury, or

equipment damage.

BMX ART 0414/814

35011978 07/2012 133

The pin assignment for the 40-pin FCN connector and the sensors wiring is shown

below:

MS+: RTD Measure + input / Thermocouple + input

MS-: RTD Measure - input / Thermocouple - input

EX+: RTD probe current generator + output

EX-: RTD probe current generator - output

NC: Not connected

DtC: The CJC sensor detection input is connected to CJ+ if the sensor type is DS600. It is not

connected (NC) if the sensor type is LM31.

NOTE: The CJC sensor is needed for TC only.

Module Front View - cabling view

Left connector Right connector (BMX ART 414 only)

Cold Junction

temp. sensor

Thermocouple

2-wire RTD probe

3-wire RTD probe

4-wire RTD probe

Channel 6/2

Channel 7/3

Channel 5/1

Channel 4/0

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1B A

EX+EX-

EX+EX-

MS- MS+

MS- MS+

EX+EX-

EX+EX-

MS- MS+

MS- MS+

CJO CJ-

CJ+DtC

NCNC

NCNC

NC

NC NC

NC

NCNC

NCNC

NCNC

NCNC

NCNC

NCNC

NCNCB A

Cold Junction

temp. sensor

2-wire RTD probe

3-wire RTD probe

4-wire RTD probe

TC

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1B A

EX+EX-

EX+EX-

MS- MS+

MS- MS+

EX+EX-

EX+EX-

MS- MS+

MS- MS+

CJO CJ-

CJ+DtC

NCNC

NCNC

NCNC

NCNC

NCNC

NCNC

NCNC

NCNC

NCNC

NCNCB A

BMX ART 0414/814

134 35011978 07/2012

Cold Junction Compensation

For each block of 4 channels (channels 0 to 3 and channels 4 to 7), the external

compensation of the module is performed in the TELEFAST ABE-7CPA412

accessory. This device provides a voltage in mV corresponding to:

Voltage = (6.45 mV * T) + 509 mV (where T = temperature in ° C).

The overall margin of error when using this device is reduced to 1.2° C in the -5° C to

+60° C temperature range.

It is possible to increase the precision of the compensation by using a 2/3-wires

Pt100 probe directly connected to channels 0 and 4 (only for the BMX ART0814)

on the module or connected to the TELEFAST terminal blocks. Channel 0 is thus

dedicated to the cold junction compensation of channels 1, 2 and 3. channel 4 is

thus dedicated to channels 4 to 7.

It is also possible, by using a 2-wire Pt100 probe, provided the initial length of the

probe is limited, to maintain channel 0 as a thermocouple input.

The wiring would then look like this:

The wiring is only valid if the channel 0 is used. If the channel 0 is not used, select

a cold junction with external Pt100. The range of the channel 0 is changed to a 3-

wires Pt100 probe.

The wiring would then look like this:

NOTE: For the BMX ART 0814 Module, the CJC values of channels 4 to 7 can also

be used for channels 0 to 3. Therefore, only one external CJC (see page 135)sensor is wired on channel 4.

BMX ART 0414/814

35011978 07/2012 135

Use of the TELEFAST ABE-7CPA412 Accessory

At a Glance

The TELEFAST ABE-7CPA412 accessory is a base unit used to connect 4-channel

analog modules to screw terminal blocks.

NOTE: When the cabinet where the TELEFAST ABE-7CPA412 accessory is

located and powered up, wait at least 45mn to achieve full precision of the CJC

compensation. It is not necessary to wait 45 mn if the compensation is performed by

an external Pt100 probe.

When using the TELEFAST ABE-7CPA412’s cold junction compensation, in order

to make sure you achieve the indicated level of precision, the movement of air

around the TELEFAST ABE-7CPA412 must not exceed 0.1 m/s. Temperature

variations must not exceed 10° C/hour and the TELEFAST ABE-7CPA412 must be

placed at least 100mm away from all heat sources.

The TELEFAST ABE-7CPA412 can be operated from -40° C to +80° C external

temperature.

Connecting Sensors

Sensors may be connected to the TELEFAST ABE-7CPA412 accessory as shown

in this illustration (see page 128).

Wirings

Legend: Operating in TC mode with Telefast internal cold junction compensation.

2520

1510

51

1 2 3 4

200

100

201

101

202

102

203

103

204

104

205

105

206

106

207

107

T× Probe

EX0+ EX0- MS0 + MS0 - EX1+ EX1- MS1 + MS1 -

EX2+ EX2- MS2 + MS2 - EX3+ EX3- MS3 + MS3 -

BMX ART 0414/814

136 35011978 07/2012

Legend: Operating in TC mode with cold junction compensation using a 2-wire PT100 probe.

Legend: Operating in TC mode with cold junction compensation using a 3-wire PT100 probe.

Connecting Modules

Modules can be connected to a TELEFAST ABE-7CPA412 as shown in the

illustration below:

The BMX ART 0414/0814 analog modules may be connected to the TELEFAST

ABE-7CPA412 accessory using one of the following cables:

BMX FCA 152: length 1.5 m

BMX FCA 302: length 3 m

BMX FCA 502: length 5 m

bmx art 0414/0814 analog input modules · bmx art 0414/814 120 35011978 07/2012 analog input values...

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